Basic Dimensions
Basic Dimensions
(OP)
Are the two examples in the attached image equal?
If X + Y = Z?
If X + Y = Z?
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RE: Basic Dimensions
RE: Basic Dimensions
That said, there are still pro's and cons to each way, it just doesn't affect tolerances.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Basic Dimensions
Basic dimensions themselves have no directly applied tolerances, so in your case both examples mean the same (if I am guessing correctly what is on your sketch).
RE: Basic Dimensions
My impression is; basic dimensions should not make any difference the path, the end result will be the same.
RE: Basic Dimensions
Going back to the datum all the time may be a bit better for inspection & even manufacturing but doesn't capture design intent the same way much of the time.
So, the customer may have a point, but from a finished item point of view it shouldn't make a difference.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Basic Dimensions
I would ask why the customer wants to change the scheme. In my experience, requests for changing between equivalent dimension structures have often been a sign of not understanding GD&T.